Chine works



Feb. 3, 1931. J. A. JESSEN 1,790,818

STOP MOTION FOR TWISTING MACHINES Filed Aug. 2, 1929 3 Sheets-Sheet l 37 a g 62 I9 46 2 "25 4 r :j 23 g; I|l 4 22 Q v\g INVENTOR.

BY MW- Feb. 3, 1931. J. A. JESSEN 1,790,818

STOP MOTION FOR TWISTING MACHINES Filed Afig. 2, 1929 3 Sheets-Sheet 2 Q INVENTOR.

RY JM ATTORND 5 Feb. 3, 1931. J. A. JESSEN 1,790,813

' STOP MOTION FOR TWISTING MACHINES Filed Aug. 2, 1929 3 Sheets-Sheet 3 INVENTOR.

BY, $vk a. v fi TTORNEYS i Patented 3, 1931,

" I i,7910,s1 s;

JOHN A. JnssEN, or wHITINsvILLE', MASSACHUSETTS, AssIenoR TOQTHE'WYHITIY'N as onmiiwonks,OFWHITINSVILLE; AssAoHUsnr-Ts, A CORPORATION or IMASSA-V v enusnmrs I error Marion ronrwis'rme Mi oHIN-Es 1 Application-"filed August 2, 1929, seri ino. 383,065. v

This invention relates to a stop-motion particularly designed for use on machines in'which'two or more strands of yarn are a twisted together to form a thread. Infsuch 5 machines,it is desirable to, stop the feed of yarn whenever anyone of the strands of yarn is broken, as otherwisea thread of less than the desired size and strength will be produced. Y

It is the general object of my invention to provide an improved mechanism for automatically stopping the feed of .yarn toany V s'pindle'jwhenever any one of the yarn strands associated therewith is broken.

15 A -further object is to provide a stop motion which will also stop the machine for a; thread broken below the feed rolls, but which will notbecome operative upon slight slackness of the twisted thread such as is caused by the shutting down or themachine. I q

My, invention further relates to arrangements and combinations-of parts which W ll V 'each'spmdle l1 and bobbin B; Each unitbe hereinafter describe'dand inoreparticu larly pointed out in the appended claims.

A preferred form of the invention and a modification thereof are shown in the drawings in which I Fig.1 is a sectional'side elevation ofparts showing the operation of the invention when a thread breaks between the spool and the feed rolls;

Fig. 5 is a View similar to Fig, 4 but'showing the parts when the machine is not in operationy" p I 1 Fig; 6 is a side elevation showing the operation of the invention when the twisted thread breaks below the feed rolls;

of my invention applied thereto;

.Figs. '8 and 9 are enlarged side elevations 50 illustrating theoperation of-the mechanism shown iii-Fig, 7; and i monly of porcelain, is Fig. i is a side elevation of the stop motion Fig; is a sectional side elevation ofparts of a twisting machine having a modification I V I v p i D ted, as ndieated at'38 lIl Flg. 3,- to permit tiOn ofthe arrow 10in FigLG Referringsto Figs. 1 to16,'1 have illustrated Fig; 10 is a detailview looking ingthedirec the preierred form of my invention as am: bodied in a t-wisting'machine having a frame 10, spindles 11 by whichbobbinsB are'ro tated; a ring rail 12. supporting rings 18. on Y which travellers "14 are mounted, a 'c'reel15I provided with rods 16 onjwihi'ch yarn spoolsfS are r otatably mounted; andffeed rolls" 19 and 21 which two or more' strands or v areii'edv to a yarn guide 22 from which they pass tothet'raveller 14 and bobbin B. Allof 1 these parts are'or the usualtype' and inthenii selves'for'm n'opart'of present invention;

Myiinproved stopjmotion, as shown in the drawings, is designed [for use in twisting thread from twostrands of yarn for each thread,'but may .be readily extended for use infconnection withthe twisting ofith'read from threeo'r more yarn strands." n I provide a separate stop motion u'nit for is mounted on a tandjQQ adapted tobe clamped to a. supporting bar 25, ext-ending provided with upwardly projecting portions 26 antler "A fixed'ciampin ares, preferably of rectangular crosssectiom is secured to the prOJectmg portion 26 by aclamping the feed roll. stands 2li Each-Stand'QO --is nut 29 (Fig.2). A thread guide 30, coin- V 7 'imilarly'secured'to the portion 27 bya binding nul .311 A second and movable clampi member 34: is'pivoted on ascr'ew .35. secured to the stand 20,'and'the sharply beveled clamping end there ofis adapted to swing into engage-H ment with the fixed clamping member 28,,als indicatedinFig. 4. j

The le'f hand'en'd 36, of the 'member 34is substantially heavier than itheclamping end,

the weight being increas'ed'by downwardly extending wings at ieacli'side thereof. I The fiat upper surface of the portion '36 is slotswinging upward movement of indicating members 4:0 or U-sha'ped section, and loosely pivoted e e new 3. r 'erie sl des Yarn-engaging hooks 42 are mounted in the indicating members 40, which are also provided with wings or extensions 44 adapted to engage a stud 45in a latch 46 pivoted at 47 on the stand 20. A third indicating mem ber 50, also of U-shaped section, is loosely piv oted on the screw 35 and is also provided with a wing or extension 52 (Fig. adapted to engage the stud 45.-

A rod or arm 53 is secured to thejend of themember 50 by a screw 54 threaded into the end of a stud 55. The arm 53 is provided with an ofiset porcelain guide 56, adapted to rest on the twisted thread TI The stud 55 has a reduced lower end 57 which is threaded to receive a'counterweight 58. r

A bracket 60 (Fig. 4) is clamped to the stand and provides a support for thread guides 62 by which the separate strands of yarn are guided to the stop motion.

The thread guides 62 are preferably slotted downwardly and communicate with openings 64 (Fig. 10) in the under side of the bracket 60, by the use of which the yarn is easily and conveniently inserted in the guide 62.

The normalrunning position of the parts is indicated in F ig. 1, with the yarn'strands Y passing through the guides 62 and between the fixed clamping member 28 and the movable clamping member 34, then over the yarn guide and under the hooks 42 forming the upper ends of the separate indicating members 40. The yarn then passes over the upper feed roll 21, around the lower feed roll 19, and under the member 56 to the thread guide 22, from which point it is drawn downward and wound on the bobbin in the usual manner. l

With the parts thus arranged, the indicating members 42 are' each supported by a separate yarn strand Y between the guide 30 and the upper feed roll 21, and the indicating arm '53 is supported byithe thread T which engages the member 56 between the lower feed roll 19 and the thread guide 22.

The clamping member 34 is provided with a depending hook 65 adapted to be engaged by a corresponding hook 66 on the latch 46. The yarn Y passes freely between the fixed clamping member 28 and the movable clamping member 34 so long as the member 34 is latched in the position shown in Fig. 1 If,

however, one of the yarn strands Y breaks, the corresponding hook 42 and indicating member will drop to the position indicated at the left in Fig. 4,allowing the wing portion 41 thereof to engage the stud and withdraw the latch 46, as also shown in Fig. 4.

As soon asthe latch 46 is withdrawn, the excess weight at the left hand end of the clamping member 34 causes the same to rock to the position indicated in Fig.4, clamping all of, the yarn strands Y betweenthe members 2 8 and 34 and effectively preventing any further feed of the yarn to the feed rolls 19 and 21. "Similarly, if the thread T breaks below the feed roll 20, the arm53 will swing downward, carrying the attached wing 52 in contact with the stud 45, withdrawing the latch 46, causing the clamping of the yarn stiiands, and preventing yarn feed to the'feed ro s.

if, however, the thread T is merely slackened as by the shutting down of the machine,

the arm 53 will swing slowly downward to the position shown in Fig. 5, which movement is not sulficient to engage the stud 45 and release.

the latch 46. The weight 58 is used to partially. offset the weight-of the arm 53 and guide 56, and may be adjusted as desired.

It is desirable to be able to raise the hooks 42and the member 56'to normal running po- Isition and to hold them there during the threading operation. For this purpose I provide a crank 7 0 (Fig. 5) extendin crosswise of the stop motion and-having a bearing 71 in the stand-20 and also having a handle 72 at'the side of the stand. 1 r 7 By swinging the handle 72, the crank 70 is brought under the wing portions of the indieating members 40 and and moves them all to the normal running position shown in-Fig.

1,in which position they will be retained until the handle 72 is returned to'its inoperative ,po- 4 sition, with the crank engaging a stop pin 74(Fig.5).

In Figs. 7, 8 and 9 I have shown'a simplilied construction of my improved stop motion which is operative only upon breakage of the thread T below the'feed rolls.

The parts are essentially similar to those used in the form previously described and comprise stands supporting a rod 81 on which arms82 are secured in spaced relation. Each arm 82 is provided with a supporting plate 83 on which a fixed clamping member 84 is secured. A movable clamping member 85 is pivoted at 86' and has a hook-like projection 87 engaging a hook 88 formed on a latch 89. A thread-engaging member 90 is mounted at the lower end of an arm 91 which is secured to an indicating plate 92, loosely pivoted on the stud or screw 86, and having an arm 94 adapted to engage a projection on the latch 89. I

l/Vhen the thread swings downward, its arm 94 engaging the latch 89, and withdrawing the same from the hook 87 on the movable clamping member 85. The clamping member 85 then moves upward to the position indicated in Fig. 8, preventing the delivery of any further thread or yarn to the feed rolls. i

If the thread is merely slackened gradually instead of breaking, the arm 91 will swing down slowly tothe position indicated in Fig.

85. Consequently the delivery of yarn will a .130

notbe prevented when the-threads are merely T breaks, the arm 91 slackened by the shutting down of the machine.

The operation of the mechanism shown in Figs. 7 8 and 9 is thus substantially identical with that shown in Figs. 1 to 6, but the mechanism is of more simple construction and hasa morelimited range of utility. 7

Having thus described my invention and the advantages thereof, I do, not wish to be limited to the detailsherein-disclosed,otherwise than as set forth in the claims, but what I claim is 1. In a twister stopmotion, a stand, a horizontally extending clamping bar of angular cross section fixed thereon, amovable clamping bar pivoted thereon andemovable by its own weight'to clamping position, said movable bar having an angular clamping edge, a latch to hold said movable bar in inoperative position, and means separately engaging diierent yarn strands and effective to withdraw said latch upon breakage of any strand, the end of said released movable bar engaging a. fiat face of said fixed bar with a wedging gripping action on the yarn.

2. In a twister stop motion, a stand, a horizontally extending clamping bar of angular cross section fixed thereon, a movable clamping bar pivoted thereon and movable by its own weight to clamping position, said movable bar having an angular clamping edge, a latch to hold said movable bar in inoperative position, and means separately en'gaging different yarn strands and eliective to withdraw said latch upon breakage of any strand, the end of said released movable bar engaging a flat face of said fixed bar with a'wedging gripping action on the yarn, said yarn engaging means being movable downward to an intermediate inoperative position by ravity upon thread slackness, and being urther movable by inertia beyond such inoperative position to render saidclamping members operative upon thread breakage.

3. In atwister stop motion, a stand, a horizontally extending clamping bar of angular cross section fixed thereon, a movable clamping bar pivoted thereon, said bar having a weight effective to move the bar to clamping position, said movable bar having an angular clamping edge, a latch tohold said movable bar in inoperative position, yarn engaging means connected to said bar and efi'ective to withdraw said latch upon breakage of the yarn, and means adjustably mounting said weight on said bar whereby the weight may be positioned to partially ofiset the weight of the yarn engaging means, said movable bar, when released, being eiiective to engage the fixed bar with awedging gripping action.

In testimony whereof-I have hereunto at fixed my signature.

JOHN A. JESSEN. 

